Each season there are undrafted rookie players that not only are able to make a regular season roster in the NFL, but to start and make owners, general managers, scouts and coaches scratch their heads from why they weren't picked in that April's Draft.

In the 2013 season there was no exception, so let's look at ten (plus one) undrafted rookies (with the college they attended in parentheses) who made their mark in their first season in the National Football League:

In Week 11 visiting the Houston Texans, he became the first undrafted rookie quarterback to win his first start since Matt Moore did it in 2007 with the Carolina Panthers against the Seattle Seahawks. McGloin threw three touchdown passes in a 28-23 win. He started Oakland's next five games (all losses), but it appears he can challenge Pryor for the staring role in 2014. Only other rookie undrafted quarterback started a game in 2013, Jeff Tuel of the Buffalo Bills, but he lost his only start against the Kansas City Chiefs.

2. Marlon Brown, wide receiver, Baltimore Ravens (Georgia)

Brown won a starting spot for the Ravens opposing Torrey Smith due to injuries to Jacoby Jones, and totalled 49 catches for 524 yards and 7 touchdowns, the most memorable was a 9-yard tip-toe catch in the back of the end zone with 4 seconds remaining in a snow-filled field against the Minnesota Vikings on week 14, helping Baltimore to a 29-26 victory. Brown was chosen Rookie of the Week for his performance.

3. Timothy Wright, tight end, Tampa Bay Buccaneers (Rutgers)

Wright played wide receiver at Rutgers, but was undrafted as he was considered too slow. Tampa Bay moved him to tight end, and won the starting spot due to injuries to Luke Stocker and Tom Crabtree. Wright caught 54 passes for 574 yards and 5 touchdowns in 2013.

4. Joseph Fauria, tight end, Detroit Lions (UCLA)

The nephew of Christian Fauria, who played tight end for 13 seasons in the NFL from 1995-2007 with Seattle, New England, Washington and Carolina, Joseph was the Lions' backup tight end behind Brandon Pettigrew. In his first career game against the Minnesota Vikings, he scored his first career touchdown. However, his biggest game was in Week 6 at Cleveland, when he caught three touchdown passes, helping the Lions to a 31-17 win over the Browns. Fauria finished the 2013 season with 18 receptions for 207 yards and 7 touchdowns.

5. Joe Vellano, defensive tackle, New England Patriots (Maryland)

More famous for tripping Andrew Luck in last week Divisional playoff game against the Indianapolis Colts, Vellano has been a starter at defensive tackle for the Patriots since the season-ending injury of long-time starter Vince Wilfork and veteran Tommy Kelly in Week 5. Vellano had two sacks and one fumble recovery in the regular season.

6. Daren Bates, linebacker, St. Louis Rams (Auburn)

Although Bates didn't started any games for the Rams the past season, he scored a touchdown on an 11-yard fumble return against the Houston Texans in week 6 and was an important part of their special teams.

7. Paul Worrilow, linebacker, Atlanta Falcons (Delaware)

8. Joplo Bartu, linebacker, Atlanta Falcons (Texas State)

Both Worrilow and Bartu became starters at outside linebacker for the Falcons due to injuries ton Sean Weatherspoon and Stephen Nicholas, and both had good seasons inspite of the Falcons' poor record last year. Worrilow finished as Atlanta's leader tackler with 79 solos and had two sacks, while Bartu had 3.5 sacks and 47 tackles. Worrilow has been mentioned as a candidate for NFL Defensive Rookie of the Year, not bad for a walk-on who played for a Division I FCS college, the second tier of College Football in America.

9. Jeff Heath, safety, Dallas Cowboys (Saginaw Valley State)

Playing at Saginaw Valley State University, a Division II school, meant that Heath had to impress the scouts in his pro day to have a shot to sign with a NFL team. He did it with his combination of strength and speed, as he made the Dallas Cowboys final roster. Heath became a starter at midseason for the Cowboys at strong safety over J.J. Wilcox. In Week 12, he returned a fumble 50 yards for a touchdown, helping Dallas to a win against the New York Giants. In Week 16, he had his first career interception ina 24-23 win against the Washington Redskins.

10. Jahleel Addae, safety, San Diego Chargers (Central Michigan)

Addae was the backup at safety of both Marcus Gilchrist and Eric Weddle for the Chargers, and played at nickel back. He had one sack, three pass defended and one fumble recovery in 2013, and is expected to challenge for a starting role in 2014.

11. Ryan Allen, punter, New England Patriots (Louisiana Tech)

Despite being chosen unanimous All-American in 2012, and winning the Ray Guy Award as the Nations' best punter both in 2011 and 2012, Allen went undrafted in 2013. The Patriots signed him as a free agent and he beat incumbent Zoltan Mesko for New England's punter job.

Allen finished the 2013 season with a 45.9 yards/per punt, ninth best among active punters. He may be more famous for his intended pass on a botched snap that resulted in a safety against the Indianapolis Colts last week in the Divisional playoffs. Despite injuring his shoulder on the play, Allen is slated to play in the AFC Champioship game against the Denver Broncos.